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iwlwifi: mvm: rs: disable MCS9 Tx workaround 

MCS9 introduces some corner cases in the current rs
algorithm which may lead to non optimal throughput and
instability in the throughput. Until all the corner
cases are resolved disable MCS9 for Tx as a workaround
which yields better throughput results as MCS8 is much
more stable.

Signed-off-by: Eyal Shapira <eyal@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Eyal Shapira 2013-12-11 09:32:28 +02:00 committed by Emmanuel Grumbach
parent be2056fce8
commit 4623a26575
1 changed files with 8 additions and 0 deletions
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8
drivers/net/wireless/iwlwifi/mvm/rs.c
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@ -2207,6 +2207,10 @@ static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
if (i == IWL_RATE_9M_INDEX)
continue;
/* Disable MCS9 as a workaround */
if (i == IWL_RATE_MCS_9_INDEX)
continue;
/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
if (i == IWL_RATE_MCS_9_INDEX &&
sta->bandwidth == IEEE80211_STA_RX_BW_20)
@ -2225,6 +2229,10 @@ static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
if (i == IWL_RATE_9M_INDEX)
continue;
/* Disable MCS9 as a workaround */
if (i == IWL_RATE_MCS_9_INDEX)
continue;
/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
if (i == IWL_RATE_MCS_9_INDEX &&
sta->bandwidth == IEEE80211_STA_RX_BW_20)